#region Using Directives and Copyright Notice

// Copyright (c) 2006-2010, Bit Plantation (ABN 80 332 904 638)
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the Computer Consultancy Pty Ltd nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
// ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE 
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.

using System;
using System.Collections;

#endregion

namespace Interlace.DatabaseManagement
{
	public class DatabaseVersionEdgeSet
	{
		Hashtable _fromEdges = new Hashtable();
		ArrayList _emptyArray = new ArrayList();

		public DatabaseVersionEdgeSet(DatabaseSchemaUpgrade[] upgrades)
		{
			foreach (DatabaseSchemaUpgrade upgrade in upgrades)
			{
				DatabaseVersionEdge edge = new DatabaseVersionEdge(upgrade);

				if (!_fromEdges.Contains(edge.FromVersion))
				{
					_fromEdges[edge.FromVersion] = new ArrayList();
				}

				(_fromEdges[edge.FromVersion] as ArrayList).Add(edge);
			}
		}

		public ArrayList GetEdgesFrom(string fromVersion)
		{
			if (_fromEdges.Contains(fromVersion))
			{
				return _fromEdges[fromVersion] as ArrayList;
			}
			else
			{
				return _emptyArray;
			}
		}
	}
}
